[Objective] Under the dual-carbon target

coal-fired units are transitioning from operating under long-term stable loads to flexible operation. The deep peak shaving capability has become a critical indicator of the flexibility of coal-fired power units. However

deep peak shaving operations lead to rapid changes in the generator's hotspot temperatures

causing faults such as winding deformation

insulation wear

delamination

and wedge loosening. This paper investigates the operating state of the stator end of generators under deep peak shaving conditions. [Methods] Using COMSOL Multiphysics finite element analysis software

a multi-physics field coupling model for the stator winding was established

integrating electrical

magnetic

and mechanical fields. The vibration displacement of conductor bars and wedges was analyzed under two deep peak shaving conditions: rapid load variation and ultra-low load. Furthermore

to accelerate the adaptability of generators to deep peak shaving operation

two stator end structure optimization schemes were proposed. [Results] Simulation results showed that when the load changed at a rate of 5%/min

the vibration amplitudes of the straight section conductor bars

wedges

and slot exit conductor bars decreased by 21.19%

99.7%

and 59.05%

respectively

compared to the original structure under rated conditions. When the generator operated at 30% load

the displacement reductions were 72.46%

99.997%

and 53.85%

respectively. [Conclusion] After structural optimization

the displacement amplitudes of the straight section conductor bars

wedges and slot exit conductor bars under extreme rapid load variation conditions are significantly reduced

confirming the effectiveness of the optimized structure.